Acúmulo de nutrientes em mudas de aceroleira adubadas com fósforo e zinco

Abstract

Objetivando estudar o efeito de doses de fósforo e de zinco no acúmulo de nutrientes na folha e no caule de aceroleira ( Malpighia glabra L.), montou-se um experimento em casa de vegetação, localizada no pomar da Universidade Federal de Lavras-UFLA, utilizando-se de mudas oriundas de sementes. O delineamento experimental utilizado foi blocos casualizados, em esquema fatorial 4 x 3, constituído de 2 plantas por parcela, com 4 repetições. Os fatores consistiram de 4 doses de fósforo (0; 150; 300 e 450 mg dm-3 de P), na forma de superfosfato triplo e o zinco nas doses (0; 5 e 10 mg dm-3 de Zn), na forma de sulfato de zinco. Após 100 dias, as mudas foram colhidas, sendo avaliadas as quantidades acumuladas de N, P, K, Ca, Mg, S, B, Cu, Zn e Mn na matéria seca de folha e caule. A interação entre os nutrientes fósforo e zinco afetou positivamente nos acúmulos de Ca, Cu, Fe e Mn na matéria seca da folha de aceroleira, sendo os acúmulos dos demais nutrientes afetados positivamente pelo fósforo. O Zn só teve efeito positivo no acúmulo de zinco na matéria seca do caule. A dose 450 mg dm-3 de P proporcionou aumento no acúmulo de todos os nutrientes na folha e caule das mudas de aceroleira.

Mycorrhizal efficiency in acerola seedlings with different levels of phosphorus

“…Thus, the root colonization does not express the mycorrhizal benefit to the plant directly because it does not reflect the capacity of extra-radical mycelium. The manganese (Mn) content increased in the acerola shoots due to P levels ( Figure 4) as observed by Corrêa et al (2002b), wherein the Mn content increased due to the addition of up to 450 mg kg-1 of P. However, in the present work, all the mycorrhizal plants presented lower Mn concentration than the non-mycorrhizal plants. The higher Mn decrease was provided by G clarum, followed by G. manihotis and G. margarita.…”

Nutrient accumulation at the initial growth of pitaya plants according to phosphorus fertilization

“…Higher P amounts in the dry mass of shoots of Barbados cherry seedlings and pitaya were observed by Corrêa et al (2002) and Corrêa et al (2014), respectively, with addition of P to the substrate. Excess of P on the substrate increases their availability in the soil solution, thus favoring a greater absorption by roots, increasing this nutrient in all plant organs.…”

Comparison of mineral and trace element contents between organically and conventionally grown fruit

“…Studies investigating the association between mineral fertilization of acerola plants and the nutritional value of its fruit are scarce. According to Corrêa et al [14], phosphate fertilization of acerola plants is a common practice and the addition of zinc to these fertilizer formulas has been recommended, particularly in regions where this element is deficient. The interaction between P and Zn positively affects the accumulation of Ca, Cu, Fe and Mn in the leaves of the plant and probably in the fruits.…”

“…The interaction between P and Zn positively affects the accumulation of Ca, Cu, Fe and Mn in the leaves of the plant and probably in the fruits. In addition, the higher Ca concentration found in conventionally grown acerola might be due to the soil application of chemical fertilizers containing this nutrient in their formulation [14], or to the liming process. The higher Mo content might be explained by the use of micronutrient fertilizers containing this element and others such as Fe and Mn for conventional farming [13].…”